package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.dto.SetmealDto;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.entity.SetmealDish;
import com.itheima.reggie.mapper.SetmealMapper;
import com.itheima.reggie.service.SetmealDishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {

    @Autowired
    private SetmealDishService setmealDishService;

    /**
     * 保存与菜
     *
     * @param setmealDto setmeal dto
     */
    @Transactional
    public void saveWithDish(SetmealDto setmealDto) {
        //保存菜的基本信息
        this.save(setmealDto);
        List<SetmealDish> dishes = setmealDto.getSetmealDishes();
        dishes.stream().map((item) -> {
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());
        setmealDishService.saveBatch(dishes);
    }

    @Override
    public void removeWithDish(List<Long> ids) {
        //select count * from setmeal where id in (1,2,3)and status=1;
        //查询套餐状态,确实是否可以删除
        LambdaQueryWrapper<Setmeal> lambdaQueryWrapper = new LambdaQueryWrapper();
        lambdaQueryWrapper.in(Setmeal::getId, ids);
        lambdaQueryWrapper.eq(Setmeal::getStatus, 1);

        int count = this.count(lambdaQueryWrapper);
        if (count > 0) {
            //如果不能删除,抛出一个业务异常
            throw new CustomException("套餐正在售卖中,不能删除");
        }
        //如果可以删除,先s删除套餐表中的数据---setmeal
        this.removeByIds(ids);
        LambdaQueryWrapper<SetmealDish> lqw = new LambdaQueryWrapper<>();
        lqw.in(SetmealDish::getSetmealId, ids);
        setmealDishService.remove(lqw);
        //删除关系表中的数据----setmeal_dish
        setmealDishService.removeByIds(ids);
    }

}
